Abstract: The effects of heat treatment parameters on microstructure and mechanical properties of reduced activation ferritic/martensitic (RAFM) steels were investigated by microhardness test,microstructure observation and tensile test at room temperature.The feasible heat treatment process was determined.The results show that good microstructure and mechanical properties of the steel were obtained after solution treated at 980 ℃ for 45 min and tempered at 740 ℃ for 90 min,that the tensile strength was 760 MPa and the elongation was 19.5%,which could satisfy its working need.The recrystallization temperature was about 780 ℃,the transformation temperature from α phase region to α and γ two-phase region was about 820 ℃,γ single-phase region temperature was slightly higher than 920 ℃.